Food allergy

Hives on the back are a common allergy symptom.
Histamine, the structure shown, causes a person to feel itchy during an allergic reaction.
Degranulation process in allergy.
1 — antigen
2 — IgE antibody
3 — FcεRI receptor
4 — preformed mediators (histamine, proteases, chemokines, heparin)
5 — granules
6 — mast cell
7 — newly formed mediators (prostaglandins, leukotrienes, thromboxanes, PAF)
Skin testing on the arm is a common way for detecting an allergy, but it is not as effective as other tests.
Patch test
Epinephrine autoinjectors are portable single-dose epinephrine-dispensing devices used to treat anaphylaxis.
An example of a list of allergens in a food item

Abnormal immune response to food.

- Food allergy

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Allergy

Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment.

Hives are a common allergic symptom.
A summary diagram that explains how allergy develops
Tissues affected in allergic inflammation
Degranulation process in allergy. Second exposure to allergen. 1 – antigen; 2 – IgE antibody; 3 – FcεRI receptor; 4 – preformed mediators (histamine, proteases, chemokines, heparin); 5 – granules; 6 – mast cell; 7 – newly formed mediators (prostaglandins, leukotrienes, thromboxanes, PAF).
An allergy testing machine being operated in a diagnostic immunology lab
Skin testing on arm
Skin testing on back
Patch test
Anti-allergy immunotherapy

These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis.

Shellfish

Colloquial and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms.

Raw oysters opened and presented on a plate
A shrimp cocktail
Cooked mussels
Sakura ebi ('cherry shrimp')
Boiled Maine lobster
Scallop sandwich served in San Diego
Large shrimp or prawns for sale in Italy
A dish of cooked freshwater nerites from the Rajang River, Sarawak, Malaysia

Shellfish are among the most common food allergens.

Food intolerance

The different forms of emulsifier lecithin – powder, two different concentration liquids, granular and powder lecithin

Food intolerance is a detrimental reaction, often delayed, to a food, beverage, food additive, or compound found in foods that produces symptoms in one or more body organs and systems, but generally refers to reactions other than food allergy.

Nut (fruit)

Fruit consisting of a hard or tough nutshell protecting a kernel which is usually edible.

Chestnuts are both botanical and culinary nuts.
Some common "culinary nuts": hazelnuts, which are also botanical nuts; Brazil nuts, which are not botanical nuts, but rather the seeds of a capsule; and walnuts, pecans, and almonds (which are not botanical nuts, but rather the seeds of drupes)
Nuts being sold in a market
Raw mixed nuts, sold as a snack food.

This most often comes up regarding food allergies; a person may be allergic specifically to peanuts (which are not tree nuts but legumes), whereas others may be allergic to the wider range of nuts that grow on trees.

Sesame

"Black sesame" redirects here.

Flower of S. indicum
Sesame seed capsule
Sesame Eleusine coracana (L.) Gaertn. from the Seikei Zusetsu agriculture encyclopedia
Sesame seeds are a rich source of oil.
Magnified image of white sesame seeds
Sesame seeds are commonly added to baked goods and creative confectionery
Rolled khao phan with black sesame seeds
Sesame seed breadsticks
Sesame sweet cake
Sesame seed ball confection
Til-patti – a sesame brittle-type confection from India
Simit, koulouri, or gevrek, a ring-shaped bread coated with sesame seeds

Sesame can trigger the same allergic reactions, including anaphylaxis, as seen with other food allergens.

Fish as food

Many species of fish are caught by humans and consumed as food in virtually all regions around the world.

Fish stuffed with Thai herbs
Fish for sale in baskets at the Dubai Fish Market
A specially prepared dish of the poisonous blowfish fugu, Japan
Differential symptoms of parasite infections by raw fish. All have gastrointestinal, but otherwise distinct, symptoms.
Hawaiian food: Seared ahi and wasabi beurre blanc sauce

A seafood allergy is a food allergy to allergens which can be present in fish.

Egg white

Clear liquid contained within an egg.

A raw egg yolk surrounded by the egg white
Visual representation of protein denaturation. A globular protein becomes unfolded when exposed to heat.
Aerated egg whites are frequently employed in shaken cocktail recipes, such as this Ramos gin fizz, for textural and aesthetic purposes.
Beaten egg whites

Allergic reactions against egg white are more common than reactions against egg yolks.

Cashew

Tropical evergreen tree that produces the cashew seed and the cashew apple accessory fruit.

Anacardium occidentale, from Köhler's Medicinal Plants (1887)
Flower of cashew tree
Cashew tree
A woman uses a machine to shell cashews in Phuket, Thailand. Gloves are used for protection against contact dermatitis
Cashews as a snack
Young cashew fruits
Ripe cashew fruit
Cashew sprouts are eaten raw or cooked
Distilling cashew apple liquor (muchekele) in Mozambique
Shriveled, fermented cashew apples ready for distillation, Mozambique
Mameluca woman under a fruiting cashew tree (1641–1644) by Albert Eckhout. National Museum of Denmark
View of a cashew tree stem in Lawachara National Park, Bangladesh
Cashew Fruit

For up to 6% of children and 3% of adults, consuming cashews may cause allergic reactions, ranging from mild discomfort to life-threatening anaphylaxis.

Dermatitis

Inflammation of the skin, typically characterized by itchiness, redness and a rash.

A moderate case of dermatitis of the hands
Dermatitis of the hand
Tacrolimus 0.1%
Dermatitis
More severe dermatitis
A patch of dermatitis that has been scratched
Complex dermatitis

Establishing that there is a food allergy before dietary change could avoid unnecessary lifestyle changes.

Peanut allergy

A peanut allergy warning
Peanuts (Arachis hypogaea) - in shell, shell cracked open, shelled, peeled
An example of a list of allergens in a food item

Peanut allergy is a type of food allergy to peanuts.